I need to replace the failing hard disk on a HP Pavilion dv4000 Notebook PC. When I bought it, Windows 7 (update) was installed. I have the Product Key and DVD for w7 update, and product key for Windows XP, but no XP CD/DVD. Is it possible to install Win7 update on the new HD?

I have the Product Key for Windows7 (as well as the DVD to 'upgrade 3 PCs for a special price') and product key for Windows XP. Do I need to have the original XP CD or Restore CD to install Win7 (upgrade, nor full OEM version) on the new HD? Is there any information that I can add to make this an more clear? I no I would be far better off to buy a new laptop, considering the age of the hardware, but that is not currently inthe budget.I have the Product Key for Windows7 (as well as the DVD to 'upgrade 3 PCs for a special price') and product key for Windows XP. Do I need to have the original XP CD or Restore CD to install Win7 (upgrade, nor full OEM version) on the new HD? Is there any information that I can add to make this an more clear? I no I would be far better off to buy a new laptop, considering the age of the hardware, but that is not currently inthe budget.

It should be possible. You should search a free toll number for your country to ask Microsoft about this situation. Also you can take out your old hdd and use Ghost to mirror it on the new hdd :) - you just clone the old hdd

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The problem most likely - the laptop is old and the BIOS most likely cannot support a hard disk with a capacity of 120Gb.
Check the capacity of the old hard disk, most likely it is about 10 to 20Gb in size and you cannot buy one these days with these capacity.

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This model has built in multimedia that does not need the operating
system (or hard disk) to play movies and music. So it probably is
a bad hard drive. Laptop HDs are notorious for failure.
That being said, it doesn't take an expert to replace a hard drive and
reload the OS and you can get one pretty cheap (<$50) on eBay.
DO NOT get a Hitachi or IBM though - my pref is Western Digital or
Fujitsu. You will also need the OS disks which you may not have
as many systems are putting the install disks on the 1st HD
sector. You can usually order disks cheap from HP if you have
your purchase info. If you can downlaod and burn an iso image to
CD from another computer, the "Ultimate Boot Disk" (search Google) is a
great free testing CD.